Modular chair construction and method of assembly

A vertically adjustable chair comprising:

• a base assembly including a base and a vertically adjustable pedestal with a top actuator;
• a fixed housing engaging said pedestal;
• and
• a vertical adjustment control mechanism comprising:
• an arm pivotally mounted in said fixed housing, said arm including a bearing section for engaging said top actuator, a first section, and a handle-forming second section spaced from said first section;
• and
• an adjustment member engaging said fixed housing and said first section for pivotally supporting said first section, said adjustment member being adjustable from an exterior of said fixed housing to reposition said first section and thus reposition said bearing section relative to said top actuator to eliminate looseness and play of said arm in said fixed housing, said arm operably engaging at least one of said fixed housing and said adjustment member so that when said handle-forming second section is pivoted, said bearing section actuates said top actuator;
• said adjustment member including a slot for slidably engaging said first section of said arm, said slot limiting the movement of said first section of said arm in a predetermined direction.

In a vertically adjustable chair, the chair including a vertically adjustable pedestal with a top actuator, a fixed housing engaging the pedestal, and an actuator control mechanism pivotally mounted in said fixed housing and adapted to engage said top actuator, the improvement comprising:

• an adjustment member engaging said fixed housing and said actuator control mechanism, said adjustment member configured for adjustment from an exterior of said fixed housing to reposition said actuator control mechanism relative to said top actuator to maintain proper adjustment of said actuator control mechanism relative to said top actuator;
• and
• said actuator control mechanism including an arm having a first section and pivot-defining structure spaced from said first section, said first section engaging said adjustment member and said pivot-defining structure engaging said fixed housing so that when said handle is moved in a first direction, one of said first section and said pivot-defining structure engages a corresponding one of said actuator member and said fixed housing to pivot said arm to actuate said top actuator;
• said adjustment member being snap-attached to said fixed housing.

In a vertically adjustable chair, the chair including a vertically adjustable pedestal with a top actuator, a fixed housing engaging the pedestal, and an actuator control mechanism pivotally mounted in said fixed housing and adapted to engage said top actuator, the improvement comprising:

• an adjustment member engaging said fixed housing and said actuator control mechanism, said adjustment member configured for adjustment from an exterior of said fixed housing to reposition said actuator control mechanism relative to said top actuator to maintain proper adjustment of said actuator control mechanism relative to said top actuator;
• said actuator control mechanism including an arm having a first section and pivot-defining structure spaced from said first section, said first section engaging said adjustment member and said pivot-defining structure engaging said fixed housing so that when said handle is moved in a first direction, one of said first section and said pivot-defining structure engages a corresponding one of said actuator member and said fixed housing to pivot said arm to actuate said top actuator;
• and
• said adjustment member including a slot for slidably engaging said first section of said arm, said slot limiting movement of a second section of said arm in a predetermined direction but permitting movement of said arm in a direction opposite said predetermined direction.

In a chair control for a vertically adjustable chair, a vertical adjustment control mechanism for actuating a release member of a chair height adjustment device operably connected to the chair control, said control mechanism comprising:

• an actuator lever having a handle-supporting first end, an intermediate section and a second end;
• a first pivot on the chair control for operably engaging said first end for pivoting said intermediate section in a predetermined direction when said handle-supporting first end is moved in a first direction to operate the release member;
• a second pivot on the chair control for operably engaging said second end for pivoting said intermediate section in said predetermined direction when said handle-forming first end is moved in a second direction, opposite said first direction, to operate the release member;
• and
• one of said first and second pivots including an adjustment member having a body with a slot therein configured to operably engage the end corresponding to said one pivot, said adjustment member further having an adjustable member engaging said body for adjustably positioning said body relative to said chair control, said adjustable member being accessible from an exterior of said chair control to permit adjustment without disassembly of the adjustable chair and being adjustable to eliminate play in said actuator lever when said actuator lever is in a non-actuating position relative to the release member.

A vertically adjustable chair comprising:

• a base assembly including a base and a vertically adjustable pedestal with a top actuator;
• a fixed housing engaging said pedestal;
• and
• a vertical adjustment control mechanism comprising:
• an arm pivotally mounted in said fixed housing, said arm including a bearing section for engaging said top actuator, a first section, and a handle-forming second section spaced from said first section;
• and
• an adjustment member engaging said fixed housing and said first section for pivotally supporting said first section, said adjustment member being adjustable from an exterior of said fixed housing to reposition said first section and thus reposition said bearing section relative to said top actuator to eliminate looseness and play of said arm in said fixed housing, said arm operably engaging at least one of said fixed housing and said adjustment member so that when said handle-forming second section is pivoted, said bearing section actuates said top actuator.